How many movies have Hiroshi Unayama and Yoshihiro Yamazaki collaborated on?

They have worked on 4 movies together! Their first movie together was Karūseru Maki: yoru wa watashi o nurasu (1974) while their highest rated movie together was Hoteru hime (1983). They have not worked together since Female Teacher: Twice Raped (1983). They are most known for their drama films together.